<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul v-for="item in cartInfoList" :key="item.id" class="cart-list">
          <li class="cart-list-con1">
            <input @change="changeCheck(item,$event)" :checked="item.isChecked==1" type="checkbox" name="chk_list">
          </li>
          <li class="cart-list-con2">
            <img :src="item.imgUrl">
            <div class="item-msg">{{item.skuName}}</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{item.skuPrice}}.00</span>
          </li>
          <li class="cart-list-con5">
            <a href="javascript:void(0)" class="mins" @click="handlerFn('-',-1,item)">-</a>
            <input autocomplete="off" type="text" @change="handlerFn('input',$event.target.value,item)" :value="item.skuNum" minnum="1" class="itxt">
            <a href="javascript:void(0)" class="plus" @click="handlerFn('+',1,item)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{item.skuPrice * item.skuNum}}</span>
          </li>
          <li class="cart-list-con7">
            <a class="sindelet" @click="delCartFn(item.id)">删除</a>
            <br>
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input @change="changeCheckAll" :checked="isAll" class="chooseAll" type="checkbox">
        <span>全选</span>
      </div>
      <div class="option">
        <a @click="delAllCartFn">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择
          <span>{{totalNum}}</span>件商品</div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{totalPrice}}</i>
        </div>
        <div class="sumbtn">
          <router-link to="/trade" class="sum-btn">结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import throttle from "lodash/throttle";
import { mapGetters } from "vuex";
  export default {
    name: 'ShopCart',
    created () {
      this.getCartData()
    },
    computed: {
      ...mapGetters(['cartList']),
      cartInfoList() {
        return this.cartList.cartInfoList || []
      },
      // 计算商品总价
      totalNum() {
        let sum = 0
        let arr = this.cartInfoList.filter(item => {
          return item.isChecked == 1
        });
        sum = arr.length
        return sum
      },
      // 计算商品总价
      totalPrice() {
        let sum = 0
        let arr = this.cartInfoList.filter(item => {
          return item.isChecked == 1
        });
        arr.forEach(value => {
          sum += value.skuPrice*value.skuNum
        })
        return sum
      },
      // 计算全选
      isAll() {
        // 只要数组内全部属性的isChecked为1就为真，只要有一个不是1就为假
        return this.cartInfoList.every(item => item.isChecked == 1)
      }
    },
    methods: {
      // 点击全选的复选框修改商品的选中属性
      async changeCheckAll(e) {
        try {
          let ischecked = e.target.checked ? 1 : 0
          // console.log(ischecked);
          await this.$store.dispatch('cart/changeCheckAll', ischecked)
          this.getCartData()
        } catch (error) {
          console.log(error);
        }
      },
      // 点击删除选中商品的按钮
      async delAllCartFn() {
        try {
          await this.$store.dispatch('cart/delAllCartFn')
          this.getCartData()
        } catch (error) {
          console.log(error);
        }
      },
      // 修改商品的选中状态
      async changeCheck(cart, event) {
        // console.log(cart,event); 拿到当前商品的信息和对象
        let isChecked = event.target.checked ? 1 : 0
        await this.$store.dispatch('cart/changeCartCheckFn',{
          skuID:cart.id,
          isChecked
        })
        this.getCartData()
      },
      // 删除购物车数据
      delCartFn(id) {
        // console.log(id);
        try {
          this.$store.dispatch('cart/delCart', id)
          this.getCartData()
        } catch (error) {
          console.log(error);
        }
      },
      // 修改购物车商品的数量
      handlerFn:throttle(async function(type, value, cart) {
        // console.log(type, value, cart);
        switch (type) {
          // 点击的是加号，传+1即可
          case '+':
            value = 1
            break;
          // 点击的是减号，判断当前数量是否大于等于2，是则-1，不是传0，表示不增不减
          case '-':
            value = cart.skuNum >= 2 ? -1 : 0
            break;
          // 点击的是输入框，判断修改的值是否小于1或者是否为数字，不是的话传0表示没有任何变化，是的话则把数字取整减掉原来的数量
          case 'input':
            value = (isNaN(value)||value<1) ? 0 : parseInt(value) - cart.skuNum
            break;
          default:
            break;
        }
        // 派发action重新获取数据
        try {
          await this.$store.dispatch('detail/addOrUpdateShopCarFn',{
            skuId: cart.skuId,
            skuNum: value
          })
          this.getCartData()
        } catch (error) {
          console.log(error);
        }
      },600),
      // 获取购物车商品数据
      getCartData(){
        this.$store.dispatch('cart/getCartList')
      }
    }
  }
</script>

<style lang="less" scoped>
  .cart {
    width: 1200px;
    margin: 0 auto;

    h4 {
      margin: 9px 0;
      font-size: 14px;
      line-height: 21px;
    }

    .cart-main {
      .cart-th {
        background: #f5f5f5;
        border: 1px solid #ddd;
        padding: 10px;
        overflow: hidden;

        &>div {
          float: left;
        }

        .cart-th1 {
          width: 25%;

          input {
            vertical-align: middle;
          }

          span {
            vertical-align: middle;
          }
        }

        .cart-th2 {
          width: 25%;
        }

        .cart-th3,
        .cart-th4,
        .cart-th5,
        .cart-th6 {
          width: 12.5%;

        }
      }

      .cart-body {
        margin: 15px 0;
        border: 1px solid #ddd;

        .cart-list {
          padding: 10px;
          border-bottom: 1px solid #ddd;
          overflow: hidden;

          &>li {
            float: left;
          }

          .cart-list-con1 {
            width: 15%;
          }

          .cart-list-con2 {
            width: 35%;

            img {
              width: 82px;
              height: 82px;
              float: left;
            }

            .item-msg {
              float: left;
              width: 150px;
              margin: 0 10px;
              line-height: 18px;
            }
          }

          .cart-list-con4 {
            width: 10%;

          }

          .cart-list-con5 {
            width: 17%;

            .mins {
              border: 1px solid #ddd;
              border-right: 0;
              float: left;
              color: #666;
              width: 6px;
              text-align: center;
              padding: 8px;
            }

            input {
              border: 1px solid #ddd;
              width: 40px;
              height: 33px;
              float: left;
              text-align: center;
              font-size: 14px;
            }

            .plus {
              border: 1px solid #ddd;
              border-left: 0;
              float: left;
              color: #666;
              width: 6px;
              text-align: center;
              padding: 8px;
            }
          }

          .cart-list-con6 {
            width: 10%;

            .sum {
              font-size: 16px;
            }
          }

          .cart-list-con7 {
            width: 13%;

            a {
              color: #666;
            }
          }
        }
      }
    }

    .cart-tool {
      overflow: hidden;
      border: 1px solid #ddd;

      .select-all {
        padding: 10px;
        overflow: hidden;
        float: left;

        span {
          vertical-align: middle;
        }

        input {
          vertical-align: middle;
        }
      }

      .option {
        padding: 10px;
        overflow: hidden;
        float: left;

        a {
          float: left;
          padding: 0 10px;
          color: #666;
        }
      }

      .money-box {
        float: right;

        .chosed {
          line-height: 26px;
          float: left;
          padding: 0 10px;
        }

        .sumprice {
          width: 200px;
          line-height: 22px;
          float: left;
          padding: 0 10px;

          .summoney {
            color: #c81623;
            font-size: 16px;
          }
        }

        .sumbtn {
          float: right;

          a {
            display: block;
            position: relative;
            width: 96px;
            height: 52px;
            line-height: 52px;
            color: #fff;
            text-align: center;
            font-size: 18px;
            font-family: "Microsoft YaHei";
            background: #e1251b;
            overflow: hidden;
          }
        }
      }
    }
  }
</style>